Alex Hoppen e643fb14b5 Introduce a new syntax kind to represent missing base nodes ...

In the future, we only want to attach a source presence to tokens, not to nodes. All concreate nodes which are missing can be represented by creating the node and marking all tokens as missing, but if a syntax node carries a child, that has a base kind (like `Decl`), we can’t decide which concrete node to instantiate. Introduce `MissingDecl` etc. node for this purpose.

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2022-08-01 16:22:47 +02:00

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